There are various options if you would like to have an undetectable hidden room. You can convert a part of your house into the invisible portion. This can be accomplished easily if you choose a windowless room with just one door. By transforming the door into a bookshelf, you can easily camouflage the room behind it. This is the most common approach to having an undetectable hidden room. However, with the passage of time, people have come up with newer ideas and there are many other options you can consider.

Too bad I didn't realize that I had been sending out that message, and it had been accepted, or I might not have been so intrigued with the concept of a hidden room that no one else knew about. I kept imagining that I would be the only one who knew where the piece in the panel was located, and who knew how to push it in the right place to get the panel to move so that I could go downstairs to my hidden room.